考虑一下拥有两双网球鞋：一双轻的比赛用鞋，一双重的训练用鞋(这种技术多年被长跑选手采用)。
Consider owning two pairs of tennis shoes: a lighter game-day shoe and a heavier training shoe (this technique has been used by distance runners for years).
但在中国，这一双重化的建构是不同步的。
本文建立求解的模型有：均质油藏、双重介质油藏、径向均质复合油藏、双渗油藏和带有气顶的双重介质油藏。
The models established in the paper are homogeneous reservoir, double porosity reservoir, dual-penetrate reservoir, composite reservoir and dual-porosity reservoir with gas-cap.
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